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Crystal structures of diphosphinated group 6 Fischer alkoxy carbenes

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Abstract

The crystal structures of four diphosphinated Group 6 Fischer alkoxy carbenes with the compositions fac-(dppe)(CO)3M–C(OR′)(R) (R = Me, R′ = Et, M = Cr, 1; R = Ph, R′ = Me, M = Cr, 2; R = Me, R′ = Me, M = W, 3; R/OR′ = 3-methyl-2-oxacyclopentylidenyl, M = Cr, 4) have been determined at 243 K. Compound 1 crystallizes in the monoclinic system, space group P21/c with a = 11.2243(11) Å, b = 18.5998(18) Å, c = 15.1260(15) Å, β = 107.056(4)○, V = 3019.0(5) Å3, and Z = 4. Compound 2 crystallizes in the monoclinic system, space group P21/c with a = 11.8102(9) Å, b = 18.3152(14) Å, c = 15.0262(12) Å, β = 93.753(3)○, V = 3243.3(4) Å3, and Z = 4. Compound 3 crystallizes in the monoclinic system, space group P21/c with a = 11.3458(6) Å, b = 18.5772(9) Å, c = 15.3883(8) Å, β = 108.576(6)○, V = 3074.5(3) Å3, and Z = 4. Compound 4 crystallizes in the orthorhombic system, space group Pna21 with a = 22.6509(14) Å, b = 9.8118(6) Å, c = 13.7507(8) Å, V = 3056.0(3) Å3, and Z = 4. Steric repulsions with the dppe ligand favor a conformation with the alkoxy moiety directed toward the dppe backbone, in an E geometry, in 1–4.

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Authors and Affiliations

  1. Department of Chemistry, California State Polytechnic University, 3801 West Temple Avenue, Pomona, California, 91768

    Eric W. Reinheimer, Katherine A. Kantardjieff, Steven R. Herron, Christopher G. Tisserat & Joe A. Casalnuovo

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  1. Eric W. Reinheimer
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  2. Katherine A. Kantardjieff
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  3. Steven R. Herron
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  4. Christopher G. Tisserat
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  5. Joe A. Casalnuovo
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Correspondence to Joe A. Casalnuovo.

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Reinheimer, E.W., Kantardjieff, K.A., Herron, S.R. et al. Crystal structures of diphosphinated group 6 Fischer alkoxy carbenes. Journal of Chemical Crystallography 33, 503–514 (2003). https://doi.org/10.1023/A:1024258904251

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